1872   Using Header.id to identify "base" SCD for IID

Created: 26 May 2023

Status: Not Applicable

Part: Part 6 (2019; Edition 2.1)

Links:

Page: 23

Clause: 5.4

Paragraph: 6

Issue

According to current arrangements: value of attribute IED.owner in an IID file should be set to value of attribute Header.id of the SCD file, which was the input to IED engineering before ("base" SCD). In other word: IID file contain ONLY id of "base" SCD, it does not contain information about version and revision of SCD.

As a result: if SCD has been modified several times (and all past version-revision SCD files are stored) - the situation could be source of mistakes: SCT could take wrong SCD file (outdate SCD file).

Proposal

Two ways to solve:
1. to transfer information about version-revision of SCD file along with id.
Variants how we can do it:
a) to transfer values of all attributes (Header.id, Header.version, Header.revision of "base" SCD) in IID. Problem: we have to add new attributes to <IED> element.
b) to establish the rule in standard: any change in SCD file should cause an update (create new unique) Header.id. Problem: the variant looks like as implementation issue.
2. to indicate the situation explicitly in the text of 61850-6 (and possible problems) and state "therefore it is the responsibility of the project engineer/SCT".

Discussion Created Status
N/A 28 Nov 23 Not Applicable
N/A 28 Nov 23 Approval (N/A)
I agree with option 2 and disagree with the comment dated 05:24 UTC.
It should be an error for a IED to publish a new IID file when the corresponding current version of the SCD has a different IED section contents than that use as the basis for the IID file.
In other words, the IED/ICT must always be kept synchronized to the current SCD file before it issues a new IID.
This is an engineering/process problem that does not need techiocal solution.
Perhaps this should be considered in 61850-4?
22 Jun 23 Approval (N/A)
In AMD 2, a new mechanism to track SCL files will be defined with reference to SCL files used to create another SCL file (typically, an IID will reference the SCD which has been used to create it).

These references will use a UUID to identify uniquely a file, with version and revision, which will allow to have a real unique identifier to a specific version.

Attribute owner will be used only to identify IEDs which are under responsibility of another project.
22 Jun 23 Approval (N/A)

 

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